Set a sistem to allow users with high share ratio to share only with each other
This would work similar with a private tracker but with this you don't need a tracker.
Only users with 1.0 ratio should join in and also be able to set it higher.
Use a ratio for the last few months instead of the total to keep it fresh.
Notify users that reach the seeding goal that can join in.
this would require a totally new feature set..especially the last part about notifying people
btw you can setup a private tracker in vuze for you and your members